Canvas - floodfill leaves white pixels at edges

Question

I am creating a drawing app. I have succeeded to do everything. When I paint the image with a dark color, some white pixels appear at the edges. I tried to change the value

Answer 1

Yes, the "white" spots left out aren't actually white as there's a tiny gradient going on between white and black. Try giving it some leeway around these lines:

 if ((r <= curColor.r + 10 && r >= curColor.r - 10)  && (r >= curColor.g - 10 && r <= curColor.g + 10) && (b >= curColor.b - 10 && b <= curColor.b + 10)) {
        return false;
    }

You can modify the 10 factor until it looks good. Just tweak it until it's okay. (Might be bad code , I just woke up but you should get the picture :D )

You could also preprocess the image in a separate buffer and reduce the number of colors. That way it's easier to fill the beginning of gradients, thus reducing or elimitating the undesired effect you are describing.